3. In a giraffe with its head 2.0 m above its heart, and its heart 2.0 m above its feet, the (hydrostatic) gauge pressure in the blood at its heart is 250 torr. Assume that the giraffe stands upright and the blood density is 1.06 x 103 kg/m3. In torr find the (gauge) blood pressure (a) a the brain (the pressure is enough to perfuse the brain with blood, to keep the giraffe from fainting) and (b) at the feet (the pressure must be countered by tight-fitting skin acting like a pressure stocking). (c) If the giraffe were to lower its head to drink from a pond without splaying its legs and moving slowly, what would be the increase in the blood pressure in the brain? (Such action would probably be lethal.)

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Chapter12: Fluid Dynamics And Its Biological And Medical Applications
Section: Chapter Questions
Problem 47PE: An oil gusher shoots crude oil 25.0 m into the air through a pipe with a 0.100-m diameter....
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3. In a giraffe with its head 2.0 m above its heart, and its heart 2.0 m above its feet, the
(hydrostatic) gauge pressure in the blood at its heart is 250 torr. Assume that the giraffe stands
upright and the blood density is 1.06 × 103 kg/m3 . In torr find the (gauge) blood pressure (a) at
the brain (the pressure is enough to perfuse the brain with blood, to keep the giraffe from
fainting) and (b) at the feet (the pressure must be countered by tight-fitting skin acting like a
pressure stocking). (c) If the giraffe were to lower its head to drink from a pond without splaying
its legs and moving slowly, what would be the increase in the blood pressure in the brain? (Such
action would probably be lethal.)
Transcribed Image Text:3. In a giraffe with its head 2.0 m above its heart, and its heart 2.0 m above its feet, the (hydrostatic) gauge pressure in the blood at its heart is 250 torr. Assume that the giraffe stands upright and the blood density is 1.06 × 103 kg/m3 . In torr find the (gauge) blood pressure (a) at the brain (the pressure is enough to perfuse the brain with blood, to keep the giraffe from fainting) and (b) at the feet (the pressure must be countered by tight-fitting skin acting like a pressure stocking). (c) If the giraffe were to lower its head to drink from a pond without splaying its legs and moving slowly, what would be the increase in the blood pressure in the brain? (Such action would probably be lethal.)
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